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  1. what, you don't have a calculator?
    On the other hand, reducing these large angles to QI values, we have
    tan(-1440°) = tan(-4*360+0) = tan0°
    cot(810°) = cot(720+90) = cot(90°)
    sin(-11π/3) = sin(-4π + π/3) = sin(π/3)
    cos(1110°) = cos(3*360+30) = cos(30°)
    Now just use those familiar angles.What do you get?

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